Beckel's F-Bomb

4/17/12 7:59 AM EDT

Considering that he's a man with such Christmas spirit, it's hard to believe that Fox News' Bob Beckel could be such a scrooge.

On last night's "Hannity," Beckel, thinking the cameras weren't rolling, told fellow panelist Jennifer Stefano, that "if you say that Headstart is a failure you don't know what the f*ck you're talking about."

Dropped jaws, and a reprimand from Hannity.

"I just can't stand right wingers with their mouths running all the time," said Beckel, still thinking that the cameras were off.

"I don't apologize," said Beckel.

"Yes, you do," said Hannity.

"No, I don't. I'm not going to apologize."

Then, when Beckel finally realized they were live he changed his tone.

"We were not on the air," said a dumbstruck Beckel.

"Yeah, we really were," said Hannity.

"I'm sorry about using that foul word," said Beckel, who later took to Twitter to say: "I apologize to anyone who heard me on Hannity. I honestly thought we were off air. I just may not be cut out for the tv business. Peace"